Assessing Dynamic Atrioventricular Conduction Time to RR-interval Coupling in Athletes and Sedentary Subjects
| Autor: | Paulo Roberto, Benchimol-Barbosa, Olivassé, Nasario Junior, Jurandir, Nadal |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Adult
Treinamento de Resistência Aptidão Física Arritmias Cardíacas Eletrocardiography/methods Minieditorial Autonomic Nervous System Electrocardiography Heart Rate Humans Sedentarismo Ventricular Function Ventricular Remodeling Sedentarism Eletrocardiografia/métodos Função Ventricular Resistance Training Arrhythmias Cardiac Atletas Athletes Physical Fitness Remodelação Ventricular Keywords: Athletes Atrioventricular Node Linear Models Short Editorial |
| Zdroj: | Arquivos Brasileiros de Cardiologia |
| ISSN: | 1678-4170 |
| Popis: | Background Atrioventricular conduction time ( AVCT ) is influenced by autonomic input and subject to physiological remodeling. Objective To evaluate beat-by-beat AVCT and RR-interval variability in athletes and healthy sedentary subjects. Methods Twenty adults, including 10 healthy sedentary (Controls) and 10 elite long-distance runners (Athletes), age, weight and height-adjusted, underwent maximal metabolic equivalent (MET) assessment, and 15-min supine resting ECG recording seven days later. The interval between P-wave and R-wave peaks defined the AVCT . Mean (M) and standard deviation (SD) of consecutive RR-intervals (RR) and coupled AVCT were calculated, as well as regression lines of RR vs. AVCT (RR-AVCT) . Concordant AV conduction was defined as positive RR-AVCT slope and discordant otherwise. A multivariate linear regression model was developed to explain MET based on AVCT and RR-interval variability parameters. Significance-level: 5 %. Results In Athletes, M-RR and SD-RR values were higher than in Controls, whereas M-AVCT and SD-AVCT were not. RR-AVCT slopes were, respectively, 0.038 ± 0.022 and 0.0034 ± 0.017 (p0.05). Using a cut-off value of 0.0044 (AUC 0.92 ± 0.07; p0.001), RR-AVCT slope showed 100% specificity and 80% sensitivity. In a multivariate model, SD-RR and RR-AVCT slope were independent explanatory variables of MET (F-ratio: 17.2; p0.001), showing 100% specificity and 90% sensitivity (AUC 0.99 ± 0.02; p0.001). Conclusion In elite runners, AVCT to RR -interval dynamic coupling shows spontaneous discordant AV conduction, characterized by negative AVCT vs. RR -interval regression line slope. RR -intervals standard deviation and AVCT vs. RR -interval regression line slope are independent explanatory variables of MET (Arq Bras Cardiol. 2020; [online].ahead print, PP.0-0). |
| Databáze: | OpenAIRE |
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